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</style>
<title>事件</title>

</head>
<body>
<h1>事件</h1>

<ul>
<li><p><a href="#basic-usage">基础使用</a></p></li>
<li><p><a href="#wildcard-listeners">通配符监听器</a></p></li>
<li><p><a href="#using-classes-as-listeners">使用类作为监听器</a></p></li>
<li><p><a href="#queued-events">事件队列</a></p></li>
<li><p><a href="#event-subscribers">事件订阅者</a></p></li>
</ul>


<p><a name="basic-usage"></a></p>

<h2>基础使用</h2>

<p>Laravel 的 <code>Event</code> 类提供了一个观察者的实现，允许您在应用程序中订阅和监听事件。</p>

<p><strong>监听一个事件</strong></p>

<pre><code>Event::listen('user.login', function($user)

{

    $user-&gt;last_login = new DateTime;



    $user-&gt;save();

});
</code></pre>

<p><strong>触发一个时间</strong></p>

<pre><code>$event = Event::fire('user.login', array($user));
</code></pre>

<p>您也可以在订阅事件的时候指定优先级。高优先级的监听器会被首先运行，同等优先级的监听器将会按照订阅的顺序执行。</p>

<p><strong>带优先级的事件订阅</strong></p>

<pre><code>Event::listen('user.login', 'LoginHandler', 10);



Event::listen('user.login', 'OtherHandler', 5);
</code></pre>

<p>有些时候您可能希望停止事件触发其他监听器，这可以通过在监听器中返回 <code>false</code> 来实现：</p>

<p><strong>停止事件冒泡</strong></p>

<pre><code>Event::listen('user.login', function($event)

{

    // Handle the event...



    return false;

});
</code></pre>

<p><a name="wildcard-listeners"></a></p>

<h2>通配符监听器</h2>

<p>当注册事件监听器的时候，您可以使用星号指定通配符监听器：</p>

<p><strong>注册通配符事件监听器</strong></p>

<pre><code>Event::listen('foo.*', function($param, $event)

{

    // Handle the event...

});
</code></pre>

<p>这个监听器将处理以 <code>foo.</code> 开头的所有事件。注意事件的全名作为最后一个参数传递给监听器。</p>

<p><a name="using-classes-as-listeners"></a></p>

<h2>使用类作为监听器</h2>

<p>在某些情况下，您可能希望使用一个类来处理一个时间而不是一个闭包。监听器类将利用 <a href="/docs/ioc">Laravel IoC 容器</a> 在监听器中提供强大的依赖注入。</p>

<p><strong>注册一个监听器类</strong></p>

<pre><code>Event::listen('user.login', 'LoginHandler');
</code></pre>

<p>默认情况下，<code>LoginHandler</code> 类的 <code>handle</code> 函数将被调用：</p>

<p><strong>定义一个监听器类</strong></p>

<pre><code>class LoginHandler {



    public function handle($data)

    {

        //

    }



}
</code></pre>

<p>如果您不想使用默认的 <code>handle</code> 函数，您可以指定需要被订阅的函数。</p>

<p><strong>指定需要订阅的函数</strong></p>

<pre><code>Event::listen('user.login', 'LoginHandler@onLogin');
</code></pre>

<p><a name="queued-events"></a></p>

<h2>事件队列</h2>

<p>使用 <code>queue</code> 和 <code>flush</code> 方法，您可以把事件放入队列等待触发，而不是立即触发：</p>

<p><strong>注册一个排队事件</strong></p>

<pre><code>Event::queue('foo', array($user));
</code></pre>

<p><strong>注册一个事件清理器</strong></p>

<pre><code>Event::flusher('foo', function($user)

{

    //

});
</code></pre>

<p>最后，您可以使用 <code>flush</code> 函数清理所有时间队列。</p>

<pre><code>Event::flush('foo');
</code></pre>

<p><a name="event-subscribers"></a></p>

<h2>事件订阅者</h2>

<p>事件订阅者是可以在自身类中订阅多个时间的类。订阅者类必须定义一个 <code>subscribe</code> 函数，用以传递一个事件分发实例：</p>

<p><strong>定义一个事件订阅者</strong></p>

<pre><code>class UserEventHandler {



    /**

     * Handle user login events.

     */

    public function onUserLogin($event)

    {

        //

    }



    /**

     * Handle user logout events.

     */

    public function onUserLogout($event)

    {

        //

    }



    /**

     * Register the listeners for the subscriber.

     *

     * @param  Illuminate\Events\Dispatcher  $events

     * @return array

     */

    public function subscribe($events)

    {

        $events-&gt;listen('user.login', 'UserEventHandler@onUserLogin');



        $events-&gt;listen('user.logout', 'UserEventHandler@onUserLogout');

    }



}
</code></pre>

<p>一旦订阅者被定义，可以通过 <code>Event</code> 类注册。</p>

<p><strong>注册一个事件订阅者</strong></p>

<pre><code>$subscriber = new UserEventHandler;



Event::subscribe($subscriber);
</code></pre>
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